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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96fc501c3cf72f89a69bd6ce6264a71c0be17f06da5401bbf4d3460d52800f7b' 
  AND token = 'CZ6u83lO+bu7zig8RFyZpIev8RpLwi1O+S9AJsUS0cM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}